As you are doing B.com final year and want to do MBA then to do it you need to apply for any MBA entrance exam :
List of MBA Entrance examination in India...........

CAT MBA-Common apptituude Test-IIM

MAT-AIMA Management Aptitude Test

CMAT-Calibre Management Aptitude Test

GMAT-Graduate Management Aptitude Test

IBSAT-ICFAI Business School Aptitude Test

EMAT- Electronic Management Aptitude Test 2012

NMAT- NMIMS NMAT MBA Entrance Exam

FMS-Faculty of Management Studies MBA Entrance Exam

JEMAT-West Bengal JEMAT MBA Entrance

JMET-Joint Management Entrance Test

FSM-FORE School of Management MBA Entrance Exam

SNAP-Symbiosis National Aptitude Test

XIMB-Xavier Institute of Management MBA Entrance Exam

XAT-XLRI Xavier Aptitude Test

IGNOU OPENMAT-IGNOU OPENMAT MBA Entrance Exam etc

Best Institute for MBA in India:

Xavier Institute of Management
Jamnalal Bajaj Institute of Management
KJ Somaiya Institute of Management Studies and Research
S.P. Jain Institute of Management and Research
Nirma Institute of Managemen
Amity Business School
Indian Institute of Foreign Trade
Symbiosis Institute of Business Management

MBA Specializations:-

Accounting MBA
Computer Systems MBA
Criminal Justice MBA
eBusiness MBA
Entrepreneurship MBA
Finance MBA
Global Management MBA
Health Care Management MBA
Human Resource MBA
International Business MBA
Leadership MBA
Management MBA
Marketing MBA
Operations MBA
Project Management MBA
Technology Management MBA